% Copyright 2007 TeX Users Group.
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A test piece for {\tt cmex10}.

$$\left(\oint x y \,ds\right) 
= \left\{\int_{-\infty}^{\infty} \int_{-\infty}^{\infty}
x y \,dx\,dy\right\}$$

$$\left(\oint x y \,ds\right) = \left[ \int \int x y \,dx\,dy\right]$$

$$\sqrt{\sum_{i=1}^n (a_ia_j)}= \sqrt{\prod_{j=1}^m (b_i +b_j)}$$

$$\sqrt{\sum_{i=1} (a_ia_j)}= \sqrt{\prod_{j=1} (b_i +b_j)}$$

$$\sqrt{\sum^n (a_ia_j)}= \sqrt{\prod^m (b_i +b_j)}$$

$$\sqrt{\sum (a_ia_j)}= \sqrt{\prod (b_i +b_j)}$$

$$\Biggl(\biggl(\Bigl(\bigl((\ldots)\bigr)\Bigr)\biggr)\Biggr)$$

$$\Biggl[\biggl[\Bigl[\bigl[[\ldots]\bigr]\Bigr]\biggr]\Biggr]$$

$$\Biggl\{\biggl\{\Bigl\{\bigl\{ \{\ldots\}\bigr\}\Bigr\}\biggr\}\Biggr\}$$

$$\left(\sqrt{\sum a_ix^i \over \sum b_j ^j}\right)$$

$$\left(\sqrt{\displaystyle\sum a_ix^i \over \displaystyle\sum b_j ^j}\right)$$

That's all folks!

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